Carbon copying unit



Dec. 10, 1935. M, HOPP 2,023,958

CARBON comma UNIT Filed Dec. 3. 1934 1 5 1 w J L VENTOR.

ATTORNEY.

Patented Dec. 10, 1935 UNITED-STATES PATENT OFFICE CARBON COPYING UNIT Max Hopi New York, N. Y. Application December 3, 1934, Serial No. 755,660

Claims.

This invention relates to copying units or printed transfer sets "having carbon sheets incorporated therein.

One object of thei improved transfer set,

nvention is to provide an wherein the carbon sheets are reliably operatively retained and yet removable in a particularly simple and efficacious manner.

sheets are removable without tearing of any of the sheets, and desirably without leaving parts of torn sheets for individual removal.

A further object of the invention is the provision of improved transfer sets having few and simple parts, simply constructed and interrelated,

neat in appearance, and durableand efficient in use, and particularly manufacture.

adapted for inexpensive Other objects and advantages of the invention will become apparent ceeds as the specification pro- With the aforesaid objects in view, the invention consists in the novel combinations and arsubjoined claims, and

hereinafter described in embodiments, pointed out in the illustrated in the annexed drawing, wherein like parts are designated by the same reference characters throughout the several views.

In the drawing: Figure 1 the invention.

Fig; 2 is a cross sectional view of Fig. 1.

Fig. 3 is a side Fig. 4 is a plan view the carbon sheets in from the set.

Fig. 5 is a plan view showing of carbon sheet.

Other advantages of lined are best realized when all instrumentalities are same structure, but, useful devices may is a plan view of a device embodying on the line 2-2 edge view of the same.

of the invention showing course of being removed a modified form the invention as here outof its features and combined in one and the be prothan the whole.

those skilled in the art to (Cl. 282-8) I I which the invention appertains, that the sam may be incorporated in several different constructions. The accompanying drawing, therefore, is submitted merely as showing the preferred exemplification of the invention.

Generally described, this invention produces a carbon copying unit, transfer set or manifold device, having a binding interconnecting the writ-- ing sheet and the carbon sheets that are alternately disposed therebetween, the connection of 10 the binding with the carbon sheets being substantially weaker than the connection with the writing sheets, whereby the carbon sheets can all be removed as a unit and with a single rapid motion of the operators hand. Preferably such weaker l5.

connection is furnished by providing an irregular edge on the carbon sheet; such as an edge having one or more tongues provided by suitable cut-outs, these tongues being secured to the binding.

These tongues, which are quite thin may be tom I on exerting a pull on the carbon sheets for removing thesame, but preferably and generally, they are torn or disconnected from the adhesive binding in the well known manner. By using a plurality of such tongues, the carbon sheets are held in coincidence with the writing sheets, and lateral shifting of the carbon sheets is avoided, the tongues being held fiat by pressure on opposite sides thereof by the writing sheets. Desirably the carbon sheets project beyond the writing sheets at one corner at an edge opposite to the binding edge, and the tongues are spaced from the diagonally opposite corner at the binding edge so that the writing sheets alone may be grasped at the last mentioned cornerand the carbon sheets grasped at their projecting corner for removal as a unit.

Heretofore it has been known to provide tranafer sets having interconnections not only at the binding edge but also at other points or edges. Not only did this increase the labor of removing the carbon sheets, but it prevented separation of certain sheets as for correction of errors while the transfer was in use. 1 Then again, it has been known to provide lines of weakness of different kinds, spaced, however, from the binding, for removal of the carbon sheets along such lines of weakness. This arrangement has involved increased cost of manufacture, and, upon removal of the carbon sheets has resulted in leaving strips of carbon paper which had to be separately removed from the binding upon detachment of the writing sheets therefrom. Aside from the resulting annoyance caused in removing such strips, the operator would soil his fingers. Where perthat difliculty resulted in that the perforations would sometimes vary in size, due for example, to a difference in speed of forming the perforations, or the difference in the quality of the paper; hence the perforations would either sever the carbon paper, or afiord insufficient weakness for a rapid, accurate removal thereof.

Referring in detail to the drawing, 40 denotes a device embodying the invention. The same may be in the nature of a transfer set having a plurality of writing sheets including preferably a printed original sheet I I, and one or more copy sheets l2. Altemately disposed between the writing sheets are carbon sheets l3, having along one edge one or more spaced tongues [4, formed by suitable cut outs I5 which extend a proper distance into the sheets, for a purpose hereinafter described. The tongues I4 terminate along a line in coincidence with corresponding edges of the writing sheets, and along which line extends a suitable, preferably adhesive binding [6 of a well known character. At an opposite edge or corner of the set the carbon sheets extend beyond the writing sheets as at I! to afford a convenient finger grip portion. At the diagonally opposite corner as at I 8, the tongues are spaced away and the depth of the cut out I5 is such as to facilitate a finger grip on the writing sheets alone.

It is noted that except for the binding 16, the writing and carbon sheets are desirably not interconnected, and that the writing sheets are preferably not weakened or perforated in anymanner; in fact, no perforations, slits or the like are used at all in this device.

In course of manufacture, the carbon sheets are formed with the cut-outs l5 to provide the tongues l4, and the carbon sheets are then alternately interleaved between the writing sheets, with the tongues of the superposed carbon sheets in alinement, and terminating in coincidence with corresponding edges of the writing sheets. Now the setis adhesively bound together as with the aid of a loosely woven fabric and astrong adhesive, in a well known manner, and with the application of suitable pressure on the set. Since the tongues H act as spacers between the writing sheets, the adhesive will more fully flow around the bound edges of the writing sheets at points intermediate of and adjacent to the tongues, so as to more strongly secure the writing sheets than otherwise, and yet because of the thinness of the carbon paper, the adhesive will not flow in between the writing sheets to such a degree as to mar the appearance or prevent removal thereof from the binding l6. a

In Fig. 5 is shown a modified form of carbon sheet which may be similarly embodied in the set Hi, and in a similar manner, this sheet differing from the sheet l3 in that the tongues 20 thereof increase in width away from the binding edge, so that the tongues are stronger at their bases 2| than at the ends 22 thereof which are secured to the binding.

The manner of using the invention will now be described. The operator may write-on or insert a set l0 into a typewriter, or the like, and work in the usual manner, all the sheets being secured together and held in alinement. Sheets may be raised or separated to make a correction on a' copy sheet. Upon completion of his work, the operator may withdraw the set as a. unit from'the machine, and grasping the set with one hand at the corner 3 and with the other hand at the corner H, ex-

erts a rapid pull to remove all the carbon' sheets as a unit. While the tongues [4 may tear, yet their width and strength is preferably such that they will rather separate from the binding IE itself, and such will be the case especially for the carbon sheet l9. Now the operator may separate 5 the writing sheets from each other at the binding in the well known manner, and without having pieces of carbon paper adhering and requiring separate removal. Since in using transfer sets, the operator must be able to work with a high 10 degree of rapidity and produce neat and accurate results, the advantages afforded by this invention are of considerable importance. At the same time, the cost of the device is small, and there is no waste of writing sheet paper, and the tongue 15 portions of .the carbon sheet as may be free of carbon'to reduce the cost, prevent smudging, and cause reliable binding at "5.

I claim:

1. A bound duplicating device from which the 20 carbon sheets are more easily removable than with an ordinary binding and without tearing the carbon sheets, said device having an original sheet, a 'copy sheet, and a carbon sheet, continuous adhesive means extending along one edge 25 of said sheets and interconnecting the same, said sheets being otherwise separate of each other and being removable by tearing the adhesive connection, and the carbon sheet having cut-outs of substantial length and depth along said edge 30 providing spaced elongated narrow tongues extending along the plane of the carbon sheet and adapted to be readily torn by a pull on the latter along said plane, said tongues having free ends on removing the carbon sheet, and theends only 35 of said tongues being adhesively connected attheir ends to said means so that the carbon sheet is substantially easily removable from the device.

2. A transfer set including three ormore writing sheets, carbon sheets alternately disposed therebetween, an adhesive bindingalong an edge of the sheets interconnecting the same, and the carbon sheets having connecting means having substantially weaker direct connection with the binding than the writing sheets, said means including tongues transverse to and spaced along the binding and said direct connection being confined solely to the ends of said tongues, whereby any number of the carbon sheets can be easily removed from the transfer set by a pull along the plane thereof. 0 3. A transfer set including three or more writing sheets, carbon sheets alternately disposed therebetween, an adhesive binding along an edge of the sheets interconnecting the same, said ad-;,, hesive binding being limited to lie along the plane of said edge and having its connection with the writing sheets continuous and its connection with the carbon sheets limited to a relatively small section of the adhesive binding at said plane to facilitate detachment of the carbon sheets. 60

4. A transfer set including a plurality of writing sheets, an adhesive binding along anedge of the sheets interconnecting the same, and a carbon sheet disposed between the writing sheets and 7 having means having substantially weaker direct connection with the binding than the writing sheets, said means including a readily torn tongue projecting from the body of the carbon sheet, said tongue being relatively narrow and sub,- stantially elongated and said direct connection 70 being with the end portion of the tongue, and the carbon sheet being otherwise free of the writing sheets and of the adhesive binding along the latter.

5. A transfer set including a plurality of writ- 75 ing sheets, a carbon sheet therebetween, said carbon sheet having a rectangular body and having an integral easily torn substantially elongated tongue at one edge projecting from said body beyond an edge thereof, said tongue terminating at a plane determined by the adjacent edges of the and the said tongue in outward spaced relation from the said body of the carbon sheet, and the said edge of the carbon sheet being tree or said means and of the writing sheets, whereby the carbon sheet is readily removable from the trans- 5 ier set by exerting a pull on the carbon sheet to tear said tongue without tearing the carbon sheet.

MAX HOPP. 

